/usr/share/doc/libpam-smbpass/examples/password-migration is in libpam-smbpass 2:3.6.3-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | #%PAM-1.0
# password-migration
#
# A sample PAM configuration that shows the use of pam_smbpass to migrate
# from plaintext to encrypted passwords for Samba. Unlike other methods,
# this can be used for users who have never connected to Samba shares:
# password migration takes place when users ftp in, login using ssh, pop
# their mail, etc.
auth requisite pam_nologin.so
# pam_smbpass is called IFF pam_unix succeeds.
auth requisite pam_unix.so
auth optional pam_smbpass.so migrate
account required pam_unix.so
password requisite pam_cracklib.so retry=3
password requisite pam_unix.so shadow md5 use_authtok try_first_pass
password optional pam_smbpass.so nullok use_authtok try_first_pass
session required pam_unix.so
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